Police are continuing their hunt for the killer of the highly popular YouTube channel operator whose site is dedicated to high-powered guns and explosives.

Investigators have ruled out robbery as a motive in the murder of Keith Ratliff, who was a business partner at FPSRussia, YouTube's ninth most popular channel with more than three million active subscribers and a half billion total views.

Ratliffe, 32, was discovered dead in his office that was connected to a residence in Carnesville, Georgia.

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Mystery: Gun enthusiast Keith Ratliffe was found shot dead in his Georgia office

Armed: Ratliffe had several weapons on him when he died

'He [Ratliff] did sustain a gunshot wound that was not self-inflicted,' Mike Ayers of the Georgia Bureau of Investigation told FoxNews.com.

Police have determined the caliber of gun used to kill Ratliff, but Ayers declined to specify the weapon.

He said investigators are 'actively interviewing people and seeking leads' and that the case is 'progressing.'

'We all want to know and we all want justice to be done,' Amanda says. 'He had way to much to look forward to in his life.'

Amanda said their two-year-old son is having a terrible time adjusting to life without his father.

'It was really hard. To know that he's going to go the rest of his life without his dad,' Amanda said, as their child, Jayden, clutched a picture of his dad that was taken on Christmas Eve.

Besides running the YouTube channel, Ratliff was also the owner of FPS Industries, which works in customized weaponry.

It is located in Carnesville, which is about a 90 minute drive from Atlanta.

Ratliff, whose family lived in Frankfort, Kentucky, with his family, wrote on hisLinkedIn profile about his company, 'After a life of loving firearms and computers. I have combined both into
one great new business that offers both viral marketing and quality
firearms from one place.'